摘要:
基于对柴达木盆地构造特征和构造演化的研究,主要依据基底性质和起伏、地层展布、构造变形强度、盆地演化特征、断裂和山脉的分割性和含油气系统的分布等将柴达木盆地划分为北部块断带、茫崖坳陷、三湖坳陷和德令哈坳陷 4个一级单元和 21个二级单元。依据烃源岩的分布、生储盖组合和构造圈闭发育程度等,按Ⅰ类有利区带、Ⅱ类较有利区带和Ⅲ类远景区带对各二级构造单元进行了含油气远景评价。
Abstract:
Based on the study on tectonic features and tectonic evolution, the Qaidam Basin was divided into four first order units: the North Block-faulted Belt, the Mangya, Sanhu and Delingha Depressions, which could be subdivided into 21 second-order units mainly according to the nature and relief of basement, stratigraphic distribution, style of structural deformation, feature of basin evolution, the fault and mountain cutting and the distribution of petroleum systems. On the authority of the distribution of hydrocarbon source rocks, source-reservoir-seal association, the development of structure trap, the second-order units were assessed on hydrocarbon potential in accordance with type Ⅰ beneficial zone, type Ⅱ less beneficial zone and type Ⅲ potential zone. The type Ⅰ beneficial zone included the following units: the Kunyite Sag, the Lenghu and Eboliang Belts of the North Block-faulted Belt, the Gasi Sag, the Youquanzi and Qibei Belts of the Mangya Depression, and the Yanhu Belt of the Sanhu Depression.
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